Answer — Exercise 4
0.4 - Visitors from space·Focus 4 - Student's Book
Câu hỏi
Replace the underlined verb structures with alternatives using can’t, could, may, might and must and an infinitive or perfect infinitive. Use each modal verb once only.
Câu trả lời
- may / might / could have visited
- can't have approached
- must be
- may / might / could have been to
- may / might / could continue